Move website to Octopress

1. Moves the website to Octopress (complete with a spiffy new look)
2. Fixes outdated links
3. Adds Mac instructions

This is probably not very reviewable since it includes the Octopress history and you really need to see it live. Why don't you find me sometime this week and I can show you the site and see what you think.

The other thing to discuss about this is whether or not we want to keep this in the gh-pages branch of the main repository or if we want to move it to it's own repository since it's really a completely separate beast.